Newbie screwup. I forgot to crush my extract grains which account for about 9% of grain bill.

Does anyone have a clue as to how much it effects the efficiency? Should I assume I got 40% or 20% of the sugars or even less? I still have the opportunity to add some dry malt as I'll be starting my boil soon.

Please advise.

Thanks

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It's easier to read brewing books and get information from the forum than to sacrifice virgins to appease the brewing gods when bad beer happens!

Hard to say. You could take a gravity reading towards the end of the boil and add DME if needed at that point.

Yes ^^^ relax, you have plenty of time to add the extract if you want to get closer to your intended gravity. Mash extract efficiency estimates are based on 100% conversion , you will max out at just over 91% conversion. So multiply your expected efficiency by .91- ie .91 * .8=72.8% efficiency. But it depends on those speciality grains as they are lower in sugars and can very a lot by type as Denny has alluded.